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medRxiv and bioRxiv get most of their submissions as Word files. It's a much easier conversion, and if necessary they have manual touch-up. Not feasible for arXiv's volume.

It is a bug. Will be fixed soon.

Sorry qmarchi -- I don't know how to get your contact information here. But it shouldn't be too hard to find mine, if you try.

It was from about 10 accounts. Which we suspended. But it appears that they created new accounts overnight (daytime in China). arXiv is not well-equipped to play whack-a-mole.

And 10 accounts using 100 different IP addresses, would seem unlikely for an innocent project. And creating new accounts ...

Well, no reply from the ISP so far.